hoffmann



2 Sheets-Sheet 1.v

(No Model.)

C. HOFFMANN.

LAMP.

Patented Oct. 2, 1883.

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(No Model.) v2 Sheets-Sheet 2.

C. HOFFMANN.

LAMP.

Patented Oct. 2, l1883.

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Unirse S'rafrns PATENT trice.

CHARLES HOFFMANN, OFNENV YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 286,006, dated October 2, 1883.

Application filed July 5, IESS.

(No model.)

To a/ZZ whom, it may concern:

Be it known that I, CHARLns HOFFMANN, a citizen of the United States, residing at New York, in the county and State of New York, have invented new and useful Improvements in Lamps, of which the following is a specification.

My invention relates to certain improvements on that class of lamps which are described in Letters Patent No. 241,07 7, granted to Frederick Siemens, May 3,1881. In the different modifications shown in this patent the illuminating-gas is carried up in close prox; imity to the regenerative chamber and the air-supply passage is on the outside of the gasways, so that the gas is heated to a higher degree than the air, and whilelainps constructed in this manner give perfectly satisfactory results when used for light illuminating-gases, they cannot be used successfully for heavy gases, since such gases, when exposed to a high temperature, deposit alarge quantity of carbon, whereby the gasways areobstructed and the successful operation of the lamp is disturbed.

The principal object of my inventionV isa regenerative lamp ofthe class above described, which can be used for heavy gases as well as for light gases. The peculiar and novel construction of my lamp is pointed 'out in the following specification, and illustrated in the accompanying drawings, in which- Figure 1 represents a vertical central section of my lamp in the plane v x, Fig. 3. Fig. 2 is a horizontal section in the plane yy, Fig. 1. Fig. 3 is a similar section in the plane e' z, Fig. 1. Fig. 4t is a sectional front View of a street-lantern containing one of my lamps on. a smaller scale than the previous figures. Fig. 5 is a vertical section of the regulator on a larger scale than Fig. 4. Fig. 6 is a similar section of the block through which the gas passes to the lamp, and which is provided with a passage for carrying off the liquids of condensation.

Similarletters indicate corresponding parts.

In the drawings, the letter A designates the regenerative chamber, which connects, by a pipe, B, Figs. l and 4, with the pipeG, situated at some distance above the place of combustion. The pipeG is surrounded by apipe, D, and when the flame has been burning a few seconds the pipe C becomes heated and a strong upward draft is created through the same, so that a suction takes place through the pipe B and the products of combustion are carried down through the regenerative chamber A and through the pipe B to the pipe D, as indicated by the arrow in Fig. 1.

The illuminating-gas is supplied through the pipe E, which connects, by branch pipes F, with an annular chamber, G, and from this chamber rise four, (more or less) pipes H, which connect with an annular chamber, I, from which the gas escapes through a large number of jets J to the place of combustion. These jets are surrounded by a jacket, K, and they are separated from the regenerativechamberV A by a cylindrical shield, L. The jacket K is supplied with cold air` through `:an annular passage, M, which surrounds the gas-supply pipe E, and on the outside of the jacketK is situated a jacket, N, forming an annular space, O, into which the external air can freely pass `from below.

On the top of the regenerative chamber A is placed a small cylinder, l?, of porcelain or other refractory material, and another similar cylinder, Q, of larger diameter than the cylindcr l?, is placed on the jacket N.

Y Between the shield L and the outer surface of the regenerative chamber A is an air-space, K, so that the air which passes up through the interior of the jacket K, which includes the air-space K', is brought in direct contact with the outer surface of the regenerative chamber, while the air-space K and shield L protect the gas-jets J against the heat which radiates from the regenerative chamber, so that when the lamp is in operation the gas passing up through the gas-j ets is never heated to such a degree that a deposit of carbon is formed, while the air which passes through the jacket K to the fiame is heated suliiciently high to promote combustion and to produce a bright light.

A shield, L, is placed between the gas-pipes H and the outside surface of the regenerative chamber, so that the gas passing through said pipes is protected against the heat radiating from the regenerative chamber.

Vith theV gas-supply pipe E is combined a block, S, (see Figs. 4L and 6,) and a trap, E", which communicates with the pipe E through a channel, c, bored through block S.

From the channel a extends an oblique channel, b, with a channel, c, which communicates by means of a pipe, E', with the gasmain. The mouth of the channel I) is closed by a screw-plug, d. The gas passes through the block S, as indicated by the arrows, Fio. 6, and if any condensation takes place in the pipeE the condensed liquid runs down into the trap'E, which is closed by a cap, e, Fig. 4, so that by removing this cap from time to time the condensed liquid can be drawn out and the pipe E, which leads to the lamp, is not liable to clog up.

Vith the pipe E is combined a regulator, R, Figs. 4 and 5. The regulator, which I have represented in the drawings, consists of two chambers, c j'. The chamber c communicates through a channel, g, with the lower branch of the pipe E, and the chambery communicates with the upper branch of said pipe through a channel, h. In thel chamber j' is l situated a valve, V, which consists of a disk,

fi, and a piston, 7`,tl1e disk t' being fitted into the upper enlarged part, 7u, of the valve-chamber V', while the piston j fits the lower portion, Z, of' said valve-chamber. rIhis lower portion, Z,'communieates through a series of holes, l', with the chamber c of the regulator, and its inner edges are chamfered off', as at Z2, so that when the piston occupies the position shown in Fig. 5 a limited quantity of gas can pass Athrough into the upper portion, 7s, of the valve-chamber, whence it escapes through a series of holes, i', in the disk The gas which passes down on the sides of the piston j escapes through holes j in this piston. When just suiiicient gas pa-sses through the regulator to feed the flame, the valve is k'ept in suspension by the pressure of the gas; but if the pressure of the gas increases the valve is raised, so as to reduce the gasways at Z2, and if the pressure of the gas is diminished the valve sinks down, and the gasways at Z2 are increased. The upward movement of the valve is limited by its stem m yand the regulating-screw a, and if the valve drops clear down it can be raised by removing the screwcap 0 and pressing upon the finger-piece o', the stem of which extends up into the-lower part of the valvechamber Z. Near the bottom of' the channel his a faucet, It', through which the condensed liquid which may accumulate in'said channel can be drawn off'.

I do not wish to claim in this application for a patent the gas-regulator above described; neither do I wish to be confined in this present application for a patent to the regulator which I have shown in the drawings, since regulators of various different constructions can be used without departing from the spirit of my present invention.

Vith the pipe E is combined a shunt-pipe, E, and suitable stop-cocks are provided, so that the regulator can be shut out and the gas made to pass through the shunt-pipe.

I do not claim as my invention the regenerative chamber, whereby the products of combustion are caused to heat the combustible Vhat I claim as new, and desire to secure by Letters Patent, is-

Vinbefore described, with the 1. rIhe combination, substantiallyas hereinbefore described, with the Vregenerative chamber, the gas-jets, andthe air-jacket K, of the shield L, interposed between the outside surface of the regenerative chamber and the inner wall of the cylinder containing the gasjets.

2. The combination, substantially as hereregenerative chamber, the gas-jets, and the air-jacket K, of' the shield L, interposed betweentlie ontside surface of the regenerative chamber and the inner wall of the cylinder containing the the ai r-jacket K.

8. The combination, substantially as hereinbefore described, with the regenerative chamber,-the gaspipes H, and the air-jacket K, of the shield L', interposed between, the outside surface of the regenerative chamber and the gas-pipes II.

4. The combination, substantially as hereinbefore described, of the regenerative chamber, the gas-supply pipe E, the annular chambers G I, the gaspipes H, extending from the chamber G into the chamber I, the gasiets J, rising from the chamber I, the air-jacket K, and the shields L and L.

5. The block S, having the verticalchannels a and c, and the diagonal or inclined channel b, connecting said channels a and c, in

combination with the trap-pipe E, connected Y with the channel a, and the gas-supply pipe E', connected with the lower end of the channel c, and the gas-supply pipe E, connected with the upper end of the channel a, substantially as described.

'6. The combination of the regenerative chamber A, the gas-supply pipe E, having branches F, the annular chamber G, arranged beneath the regenerative chamber, the ammlar chamber I around the upper portion ol' the regenerative chamber, the annular series of pipes I-I, connecting the upper and lower annular chambers, the gas-jets J, rising from the upper annular chamber, and the air-jacket K, substantially as described. f

7 rlhe combination of' the regenerative chamber`A, the gas -supply pipe E, having branches F, the annular chamber G, arranged beneath the regenerative chamber, the annular chamber I around the upper portion of.' the regenerative chamber, the annular series oi pipes H, connecting the upper and lower annular chambers, the gas-jets J, rising from the upper annular chamber, the air-jackets K and N, and the shield L, between the regenerative chamber and the gasjets, substantially as described.

In testimony whereof I have hereunto set my hand and seal in the presence of two snbseribing witnesses.

CHAS. HOFFMANN. [n Vi tnesses W. HAUFF,

E. F. KAs'rENi-IUBER.

IOO

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